Dental abrasive or grinding disk



G. O. BURLEW.

DENTAL ABRASIVE 0R GRINDING DISK. APPLICATlON HLED SEPT. 6, 1919.'

1 55,888. Patented Oct; 19, 1920.

a WMM A TTORNE Y UNITED STATES PATENT OFFICE.

GILDEROY 0. BURLEW, OF NEWARK, JERSEY.

DENTAL ABRASIVE 0R GRINDING DISK.

To a]? u ham. 1' i may concern Be it known that I, GiLnERoY O. BURLEW, acitizen of the United States, residing in the city of Newark, in thecounty of Essex and State of New Jersey, have invented certain new anduseful Improvements in Dental Abrasive or Grinding Disks, of which thefollowing is a full, clear, and exact description, such as will enableothers skilled in the art to which it pertains to make and use the same.reference being had to the accompanying drawings. and to numerals ofreference marked thereon. forming a part of this specification.

It is customary in dental work to employ wheels or disks fixed upon arevolving mandrel for the purpose of grinding, cutting, and polishingteeth. These grinding wheels or disks are mounted upon a steel mandreland when so mounted the grinding wheel or disk becomes a rigid andunyielding body which causes great discomfort and pain in preparingabutments for crowns and bridge work.

Furthermore, the periphery of the grinding wheels or disks so mountedhave a tendency to become irregular thereby causing great shock andimpairing the efficiency of the work.

A grinding disk or wheel so mounted will run at an exact rightangle tothe revolving mandrel upon which it is fixed.

The grinding disk is preferably made of a compound consisting of fineparticles of carborundum or other suitable abrasive grit materialtogether with an integrating medium of primary plastic or mixable natureand capable of hardening in homogeneous mass to the desired degree, asvulcanizable rubber or a suitable substance that will securely hold theabrasive particles, but will itself wear away as the particles wear awayin the use of the disk. The disk, is primarily molded into shape fromthe compound while in a plastic or unsolidified condition. Thecomposition of the disk is then solidified by vulcanization or wellknowntreatment for hardening materials of this nature. The disk is preferablyformed with an integral boss or hub projecting from one side thereof,said hub being. provided with an aperture which receives the mandrel onwhich the disk is mountedfor use.

The object of my invention consists in providing a disk of the characterabove de- Specification of Letters Patent.

Patented Oct. 19, 1920.

Application filed September 6, 1919. Serial No. 322,176.

scribed with an elastic or yielding central core preferably of rubber,although cork felt or any other resilient substance may be substitutedwhich has the same resiliency and shock absorbing qualities as rubber,so that when fixed upon a revolving mandrel for the purpose of grinding,cutting or polishing teeth will not always run at an exact right angleto said mandrel, but owing to the resilient central core will operate atan obtuse-or acute angle to the mandrel.

The application of a resilient central core imparts to the periphery ofthe grinding disk or wheels, a certain amount of resiliency, therebyabsorbing and taking away the shock from the tooth.

These objects I perform in the preferred embodiment of my invention,which I have illustrated in the accompanying drawings, to whichreference is had, and in which similar characters of reference indicatecorresponding parts in the several views.

In the drawings, I

Figure 1 represents, a plan View of my improved device.

Fig. 2 represents a sectional view taken on line mw of Fig. 1.

Fig.3 re resents, a plan view and side elevation of t e soft rubbercore.

Fig. 4 represents, a plan view of that portion of the carborundum diskwhich subsequentlytogether with the soft rubber core, after being moldedaround and vulcanized together with said soft rubber core, forms thecompleted disk; and

Fig. 5 represents, a modified form of disk in which the soft rubbercenter is flush with the faces of the disk.

In describing the product forming my invention, I will simultaneouslydescribe the process of the same, so that those skilled in the art towhich it pertains, may gain a full knowledge of the process, as well asthe product.

In the drawings, 1 represents, a disk suitable for abrading, cutting,polishing, etc., according to the work to be done.

The disk 1 is preferably formed with an integral boss or hub 2projecting from one side thereof, said hub being provided with anaperture 3 by means of which it is secured upon the mandrel.

In the process of making these disks I employ the centralsoft rubber hub3 illustrated in Fig. 3 of the drawin s, which is first placed into asuitable mol and I then surround said hub 3 with the material whichSubsequently forms the disk and which consists preferably, of a compoundconsisting canization; there being no clear line of demarcation betweensuchhard and soft parts, thereby producing a disk with an elastic oryielding center core so that when fixed upon a revolving mandrel for thepurpose of grinding, cutting, etc., it will not always run at an exactright angle to said mandrel, but owing to the resilient central corewill 0perate at an obtuse or an acute angle to the mandrel, thusimparting to the periphery of the disk, a certain amount of resiliency,

thereby absorbing and taking away the shock from the tooth.

Experience has demonstrated that the device above described is a highly'eiiicient one and while the device shown is the preferre embodiment ofmy' invention, I do not care exercise of invention may be made by anyskilled mechanic, and such de artures from what is herein described andciiiimed not involving invention, I consider as within the scape andterms of my claim.

claim The rocess of forming abrasive or grinding'dis s, consisting inmolding around an elastic or yielding center core of rubber adapted forsoft vulcanization, a body of abrasive grit together with an integratingmedium of prlmary lastic or mixable nature such as rubber a apted forhard vulcanizationand capable of hardening in homogeneous mass, givingthe central core a soft vulcanization and giving the body of the disk ahard vulcanization.

This specification signed and witnessed this 29th day of Au st 1919.

GILD ROY O, BURLEW. Witnesses:

EDWARD A. Grr'r, FREDK. G. FISCHER.

